watcher vs theatregoer

watcher and theatregoer both are nouns.

Word	Noun	Adjective	Verb	Adverb
watcher	Yes	No	No	No
theatregoer	Yes	No	No	No

As nouns, theatregoer is a hyponym of watcher; that is, theatregoer is a word with a more specific, narrower meaning than watcher:

watcher: a close observer; someone who looks at something (such as an exhibition of some kind)
theatregoer: someone who attends the theater

watcher (noun)	theatregoer (noun)
a guard who keeps watch	someone who attends the theater
a close observer; someone who looks at something (such as an exhibition of some kind)
a person who keeps a devotional vigil by a sick bed or by a dead body